Maintenance of accurate visual color performance of displays

Abstract

A system and a method are provided for maintaining accurate visual color performance of displays. In particular, various embodiments of the present invention described herein provide a system wherein partial color certification is incorporated into the calibration procedure. In the event that the partial color certification is out of tolerance, a full certification procedure is performed. If the full certification procedure is out of tolerance, the calculated errors of the certification procedure are utilized to perform an update to a baseline profile for the display. The updated baseline profile can either replace the existing baseline profile or can be concatenated with the baseline profile to preserve the baseline behavior of the display.

1 . A computer-implemented method for maintaining accurate color performance of a display, the method comprising the steps of: 
 receiving reference color measurements;    receiving displayed color measurements from the display corresponding to the reference color measurements, wherein the display is an additive-color-based display;    receiving color tolerance information for the display;    determining a color shift based at least upon the reference color measurements and the displayed color measurements;    determining whether the color shift exceeds a color tolerance of the display based at least upon the color tolerance information;    if it is determined that the color shift exceeds the color tolerance of the display, the method further comprises the steps of:    receiving baseline profile information for the display; and    performing a moderate color correction to the baseline profile information for the display, thereby generating updated baseline profile information for the display.    
   
   
       2 . The method of  claim 1 , wherein the display is an RGB display.  
   
   
       3 . The method of  claim 1 , wherein the reference color measurements are based at least upon measurements of color patches.  
   
   
       4 . The method of  claim 3 , wherein the color patches number anywhere from approximately 3 color patches to approximately 30 color patches.  
   
   
       5 . The method of  claim 3 , wherein the color patches correspond to an additive color system.  
   
   
       6 . The method of  claim 3 , wherein the color patches are used for a color certification.  
   
   
       7 . The method of  claim 6 , wherein the color certification is a SWOP certification.  
   
   
       8 . The method of  claim 1 , wherein the determined color shift is less than or equal to approximately 15 ΔE.  
   
   
       9 . The method of  claim 1 , wherein the step of determining the color shift comprises performing a least squares fit to determine an overall color shift in red, green, and blue, and wherein the step determining whether the color shift exceeds the color tolerance of the display comprises determining whether the color shift exceeds the color tolerance of the display based at least upon the color tolerance information and the overall color shift.  
   
   
       10 . The method of  claim 9 , wherein the color tolerance information corresponds to color certification standards.  
   
   
       11 . The method of  claim 10 , wherein the color certification standards are SWOP standards.  
   
   
       12 . The method of  claim 9 , wherein the moderate color correction performed is determined based at least upon the determined overall color shift.  
   
   
       13 . The method of  claim 1 , wherein the color tolerance information corresponds to color certification standards.  
   
   
       14 . The method of  claim 13 , wherein the color certification standards are SWOP standards.  
   
   
       15 . The method of  claim 1 , wherein the step of determining whether the color shift exceeds the color tolerance of the display determines whether the color shift exceeds the color tolerance of the display for both chromatic and neutral colors.  
   
   
       16 . The method of  claim 1 , wherein the moderate color correction is a small or moderate RGB->(RGB)′ matrix correction.  
   
   
       17 . The method of  claim 16 , wherein the RGB->(RGB)′ matrix correction is a 3×3 RGB->(RGB)′ matrix correction.  
   
   
       18 . The method of  claim 1 , wherein the moderate color correction performed is determined based at least upon the determined color shift.  
   
   
       19 . The method of  claim 1 , wherein if it is determined that the color shift exceeds the color tolerance of the display, and if a full gamut of the display is to be used, the method further comprises the steps of: 
 receiving second displayed color measurements from the display corresponding to the reference color measurements, the second displayed color measurements being measured using the updated baseline profile information for the display;    determining a second color shift based at least upon the reference color measurements and the second displayed color measurements;    determining whether the second color shift exceeds the color tolerance of the display based at least upon the color tolerance information; and    if it is determined that the second color shift does not exceed the color tolerance of the display, replacing the baseline profile information with the updated baseline profile information.    
   
   
       20 . The method of  claim 1 , wherein if it is determined that the color shift exceeds the color tolerance of the display, and if a gamut of the display is to be restricted to a baseline gamut, the method further comprises the steps of: 
 receiving second displayed color measurements from the display corresponding to the reference color measurements, the second displayed color measurements being measured using the updated baseline profile information for the display;    determining a second color shift based at least upon the reference color measurements and the second displayed color measurements;    determining whether the second color shift exceeds the color tolerance of the display based at least upon the color tolerance information; and    if it is determined that the second color shift does not exceed the color tolerance of the display, concatenating the updated baseline profile information with the baseline profile information.    
   
   
       21 . One or more computer-accessible memories storing computer code for implementing a method for maintaining accurate color performance of a display, wherein the computer code comprises: 
 code for receiving reference color measurements;    code for receiving displayed color measurements from the display corresponding to the reference color measurements, wherein the display is an additive-color-based display;    code for receiving color tolerance information for the display;    code for determining a color shift based at least upon the reference color measurements and the displayed color measurements;    code for determining whether the color shift exceeds a color tolerance of the display based at least upon the color tolerance information;    code for receiving baseline profile information for the display, if it is determined that the color shift exceeds the color tolerance of the display; and    code for performing a moderate color correction to the baseline profile information for the display, thereby generating updated baseline profile information for the display, if it is determined that the color shift exceeds the color tolerance of the display.    
   
   
       22 . The one or more computer-accessible memories of  claim 21 , wherein the display is an RGB display.  
   
   
       23 . The one or more computer-accessible memories of  claim 21 , wherein the reference color measurements are based at least upon measurements of color patches, wherein the color patches number anywhere from approximately 3 color patches to approximately 30 color patches.  
   
   
       24 . The one or more computer-accessible memories of  claim 21 , wherein the reference color measurements are based at least upon measurements of color patches, and wherein the color patches are used for a color certification.  
   
   
       25 . The one or more computer-accessible memories of  claim 21 , wherein the determined color shift is less than or equal to approximately 15 ΔE.  
   
   
       26 . The one or more computer-accessible memories of  claim 21 , wherein the code for determining the color shift comprises code for performing a least squares fit to determine an overall color shift in red, green, and blue, wherein the code for determining whether the color shift exceeds the color tolerance of the display comprised code for determining whether the color shift exceeds the color tolerance of the display based at least upon the color tolerance information and the overall color shift, and wherein the code for performing the moderate color correction performs the moderate color correction based at least upon the determined overall color shift.  
   
   
       27 . The one or more computer-accessible memories of  claim 21 , wherein the moderate color correction is a small or moderate RGB->(RGB)′ matrix correction.